feat: make query timeout configurable via global settings (default 30s)

Add queryTimeoutSecs to editor settings with UI control in the settings
dialog. 0 means no timeout. Applied to all query execution paths including
sidebar table data loading and EXPLAIN queries.

Closes #441.

apps/desktop/src/stores/queryStore.ts

@@ -643,18 +643,20 @@ export const useQueryStore = defineStore("query", () => {
       }
 
       console.info("[DBX][executeTabSql:execute-multi:start]", { traceId, elapsed: elapsed() });
-      const executionOptions =
-        typeof pageLimit === "number"
+      const executionOptions = {
+        ...(typeof pageLimit === "number"
           ? useAgentResultSession
             ? {
                 maxRows: pageLimit,
                 fetchSize: pageLimit,
                 pageSize: pageLimit,
                 resultSessionId: options?.pagination?.sessionId,
-                clientSessionId: tab.id,
               }
-            : { maxRows: pageLimit, fetchSize: pageLimit, clientSessionId: tab.id }
-          : undefined;
+            : { maxRows: pageLimit, fetchSize: pageLimit }
+          : {}),
+        clientSessionId: tab.id,
+        timeoutSecs: settingsStore.editorSettings.queryTimeoutSecs,
+      };
       const results = await api.executeMulti(
         tab.connectionId,
         tab.database,
@@ -755,6 +757,7 @@ export const useQueryStore = defineStore("query", () => {
     try {
       const result = await api.executeQuery(tab.connectionId, tab.database, built.sql, tab.schema, executionId, {
         clientSessionId: tab.id,
+        timeoutSecs: useSettingsStore().editorSettings.queryTimeoutSecs,
       });
       const current = tabs.value.find((t) => t.id === id);
       if (current?.explainExecutionId === executionId) {

apps/desktop/src/stores/settingsStore.ts

@@ -187,6 +187,8 @@ export interface EditorSettings {
   columnFormatters: Record<string, ColumnFormatterConfig>;
   customColumnFormatters: Record<string, CustomColumnFormatterConfig>;
   snippets: SqlSnippet[];
+  /** Query timeout in seconds. 0 = no timeout. Default 30s. */
+  queryTimeoutSecs: number;
 }
 
 export const EDITOR_THEMES: { value: EditorTheme; label: string; dark: boolean }[] = [
@@ -232,6 +234,7 @@ export const DEFAULT_EDITOR_SETTINGS: EditorSettings = {
   columnFormatters: {},
   customColumnFormatters: {},
   snippets: DEFAULT_SQL_SNIPPETS,
+  queryTimeoutSecs: 30,
 };
 
 export const STORAGE_KEY = "dbx-editor-settings";
@@ -283,6 +286,11 @@ function normalizeSqlSnippets(value: unknown, existing?: SqlSnippet[]): SqlSnipp
   return valid;
 }
 
+function normalizeQueryTimeoutSecs(value: unknown): number {
+  if (typeof value === "number" && Number.isFinite(value) && value >= 0) return value;
+  return DEFAULT_EDITOR_SETTINGS.queryTimeoutSecs;
+}
+
 export function normalizeEditorSettings(settings: Partial<EditorSettings>, existing?: EditorSettings): EditorSettings {
   return {
     fontFamily: settings.fontFamily ?? DEFAULT_EDITOR_SETTINGS.fontFamily,
@@ -306,6 +314,7 @@ export function normalizeEditorSettings(settings: Partial<EditorSettings>, exist
     columnFormatters: normalizeColumnFormatters(settings.columnFormatters),
     customColumnFormatters: normalizeCustomColumnFormatters(settings.customColumnFormatters),
     snippets: normalizeSqlSnippets(settings.snippets, existing?.snippets),
+    queryTimeoutSecs: normalizeQueryTimeoutSecs(settings.queryTimeoutSecs),
   };
 }
 
@@ -408,6 +417,9 @@ export const useSettingsStore = defineStore("settings", () => {
     const normalizedPartial = {
       ...partial,
       ...(partial.pageSize !== undefined ? { pageSize: normalizeResultPageSize(partial.pageSize) } : {}),
+      ...(partial.queryTimeoutSecs !== undefined
+        ? { queryTimeoutSecs: normalizeQueryTimeoutSecs(partial.queryTimeoutSecs) }
+        : {}),
       ...(partial.sidebarHiddenTablePrefixes !== undefined
         ? { sidebarHiddenTablePrefixes: normalizeSidebarHiddenTablePrefixes(partial.sidebarHiddenTablePrefixes) }
         : {}),